236 lines
6.4 KiB
C
236 lines
6.4 KiB
C
/*
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* Copyright (c) 1989, 1990, 1991, 1993, 1994, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-rip.c,v 1.49 2001/05/10 05:30:22 fenner Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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struct rip {
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u_char rip_cmd; /* request/response */
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u_char rip_vers; /* protocol version # */
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u_short rip_zero2; /* unused */
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};
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#define RIPCMD_REQUEST 1 /* want info */
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#define RIPCMD_RESPONSE 2 /* responding to request */
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#define RIPCMD_TRACEON 3 /* turn tracing on */
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#define RIPCMD_TRACEOFF 4 /* turn it off */
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#define RIPCMD_POLL 5 /* want info from everybody */
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#define RIPCMD_POLLENTRY 6 /* poll for entry */
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#define RIP_AUTHLEN 16
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struct rip_netinfo {
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u_short rip_family;
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u_short rip_tag;
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u_int32_t rip_dest;
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u_int32_t rip_dest_mask;
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u_int32_t rip_router;
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u_int32_t rip_metric; /* cost of route */
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};
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static void
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rip_printblk(const u_char *cp, const u_char *ep)
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{
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for (; cp < ep; cp += 2)
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printf(" %04x", EXTRACT_16BITS(cp));
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return;
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}
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static void
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rip_entry_print_v1(register int vers, register const struct rip_netinfo *ni)
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{
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register u_short family;
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/* RFC 1058 */
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family = EXTRACT_16BITS(&ni->rip_family);
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if (family != AF_INET) {
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printf(" [family %d:", family);
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rip_printblk((u_char *)&ni->rip_tag,
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(u_char *)&ni->rip_metric +
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sizeof(ni->rip_metric));
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printf("]");
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return;
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}
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if (ni->rip_tag || ni->rip_dest_mask || ni->rip_router) {
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/* MBZ fields not zero */
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printf(" [");
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rip_printblk((u_char *)&ni->rip_family,
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(u_char *)&ni->rip_metric +
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sizeof(ni->rip_metric));
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printf("]");
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return;
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}
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printf(" {%s}(%d)", ipaddr_string(&ni->rip_dest),
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EXTRACT_32BITS(&ni->rip_metric));
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}
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static void
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rip_entry_print_v2(register int vers, register const struct rip_netinfo *ni)
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{
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register u_char *p;
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register u_short family;
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u_char buf[RIP_AUTHLEN];
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/* RFC 1723 */
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family = EXTRACT_16BITS(&ni->rip_family);
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if (family == 0xFFFF) {
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if (EXTRACT_16BITS(&ni->rip_tag) == 2) {
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memcpy(buf, &ni->rip_dest, sizeof(buf));
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buf[sizeof(buf)-1] = '\0';
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for (p = buf; *p; p++) {
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if (!isprint(*p))
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break;
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}
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if (!*p) {
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printf(" [password %s]", buf);
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} else {
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printf(" [password: ");
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rip_printblk((u_char *)&ni->rip_dest,
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(u_char *)&ni->rip_metric +
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sizeof(ni->rip_metric));
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printf("]");
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}
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} else {
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printf(" [auth %d:",
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EXTRACT_16BITS(&ni->rip_tag));
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rip_printblk((u_char *)&ni->rip_dest,
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(u_char *)&ni->rip_metric +
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sizeof(ni->rip_metric));
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printf("]");
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}
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} else if (family != AF_INET) {
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printf(" [family %d:", family);
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rip_printblk((u_char *)&ni->rip_tag,
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(u_char *)&ni->rip_metric +
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sizeof(ni->rip_metric));
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printf("]");
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return;
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} else { /* AF_INET */
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printf(" {%s", ipaddr_string(&ni->rip_dest));
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if (ni->rip_dest_mask)
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printf("/%s", ipaddr_string(&ni->rip_dest_mask));
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if (ni->rip_router)
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printf("->%s", ipaddr_string(&ni->rip_router));
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if (ni->rip_tag)
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printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
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printf("}(%d)", EXTRACT_32BITS(&ni->rip_metric));
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}
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}
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void
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rip_print(const u_char *dat, u_int length)
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{
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register const struct rip *rp;
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register const struct rip_netinfo *ni;
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register int i, j, trunc;
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i = min(length, snapend - dat) - sizeof(*rp);
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if (i < 0) {
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printf(" [|rip]");
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return;
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}
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rp = (struct rip *)dat;
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switch (rp->rip_vers) {
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case 0:
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/*
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* RFC 1058.
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*
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* XXX - RFC 1058 says
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*
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* 0 Datagrams whose version number is zero are to be ignored.
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* These are from a previous version of the protocol, whose
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* packet format was machine-specific.
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*
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* so perhaps we should just dump the first few words of
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* the packet, in hex.
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*/
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printf(" RIPv0: ");
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ni = (struct rip_netinfo *)(rp + 1);
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rip_printblk((u_char *)&ni->rip_family,
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(u_char *)&ni->rip_metric +
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sizeof(ni->rip_metric));
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break;
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default:
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switch (rp->rip_cmd) {
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case RIPCMD_REQUEST:
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printf(" RIPv%d-req %d", rp->rip_vers, length);
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break;
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case RIPCMD_RESPONSE:
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j = length / sizeof(*ni);
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if (j * sizeof(*ni) != length - 4)
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printf(" RIPv%d-resp [items %d] [%d]:",
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rp->rip_vers, j, length);
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else
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printf(" RIPv%d-resp [items %d]:",
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rp->rip_vers, j);
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trunc = (i / sizeof(*ni)) != j;
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ni = (struct rip_netinfo *)(rp + 1);
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for (; (i -= sizeof(*ni)) >= 0; ++ni) {
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if (rp->rip_vers == 1)
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rip_entry_print_v1(rp->rip_vers, ni);
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else
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rip_entry_print_v2(rp->rip_vers, ni);
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}
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if (trunc)
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printf("[|rip]");
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break;
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case RIPCMD_TRACEON:
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printf(" RIPv%d-traceon %d: \"", rp->rip_vers, length);
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(void)fn_print((const u_char *)(rp + 1), snapend);
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fputs("\"", stdout);
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break;
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case RIPCMD_TRACEOFF:
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printf(" RIPv%d-traceoff %d", rp->rip_vers, length);
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break;
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case RIPCMD_POLL:
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printf(" RIPv%d-poll %d", rp->rip_vers, length);
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break;
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case RIPCMD_POLLENTRY:
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printf(" RIPv%d-pollentry %d", rp->rip_vers, length);
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break;
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default:
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printf(" RIPv%d-#%d %d", rp->rip_vers, rp->rip_cmd,
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length);
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break;
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}
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}
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}
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